phelps



3 Sheets (No Model.)

Sheet 1. Y

L. J. PHELPS.

RLRCTRIC ROCK DRILL.

No. 366,184.. Patented July 5, 1887.

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3 sheetssheet 3.

.................... j .M/ E w @M L J PHELPS ELECTRIC BooK DRILL.

(No Model.)

UNITED STATES PATENT EErCE.

LUGIUS J. PHELPS, OF YORK, N. Y., ASSIGNOR TO CHARLES A.

GHEEVER, TRUSTEE, OF SAME PLAGE.

ELECTRIC ROCK-DRILL..

SPECIFICATION forming part of Letters Patent No. 366,184, dated July 5, 1887.

Application filed December 31` 1885, Serial No. 187,275. (No model.)

To cLZZ whom, t may concern:

Be it known that I, Lucius J. PnELrs, a citizen of the United States, residing in the eity, county, and State of New York, have invented certain new and useful Improvements in Electric Rock-Drills, of which the following is a specification.

The objects of the invention are to secure simplicity in construction and efficiency in action.

The subjectmatter claimed is specifically designated at the end of the specification.

My improved drill, while capable of a great variety of uses, is especially adapted for drilling rock or other hard substances.

So far as my knowledge extends, electric drills may, for the purposes of this specilication, be divided into threey classes: first, those in which a core or armature actuating the drillstock reeiprocates endwise through a solenoid 5 second, those in which an armature vibrating on a pivot actuates the drill, and, third, those in which a rotating armature actuates the drill through the intervention of belting, of a cam, or of gearing. Investigation and experience convince me that all these plans consume too much power in proportion tothe results attained to be practically successful. I have, however, discovered and demonstrated that the requisite effectiveness may be obtained by the organization hereinafter described, which, generally stated, consistsin actuating the drill through the intervention of cranks and conneeting-rods directly from the revolving armature of an electric motor. This discovery and demonstration have led to the invention of numerous improvements, all of which are represented in the accompanying drawings as embodied in one organized apparatus. Some of these improvements, however, may be used without the others, and in apparatus differing in construction from that herein shown.

In the accompanying drawings, which represent all my improvements as embodied in the best way now known to me, Figure 1 is a front elevation; Fig. 2, a side elevation, partly in section; Fig. 3, acentral horizontal transverse section therethrough Fig. 4, a central vertical section of the upper portion of the motor.

As my improved drill is one of that class in replaced when desired.

advantageously to its work, it is important that the frame should be readily adjustable on its supports, that it should be strong and rigid to bear the shocks to which it is exposed, that the mechanism should be protected from injury by accidental blows, and be so balanced and centered in the frame as to minimize the working strain to the greatest practical extent. These ends I attain in this instance by constructing the frame of two oval-shaped yokes, A A', provided with flanges or ears a' e', to serve as `points of attachment for the legs or supports of the frame, as well as to strengthen it. four rods, B, provided with nuts and screws, so that the parts can be readily removed or The front tubular legs, C, provided with braeingears c, are se curely clamped tothe ends of the lower yoke, A', by nuts and screws in such manner 4as to permit the legs to be adjusted around their pivots to vary the angle of the legs relatively to the drill. Feet Gslide endwise in these tubular legs,and are held at any desired point by means of set-screws c', thus enabling the lengths of the legs to be adjusted. The back leg, C, is similarly constructed and adjusted. Its upper end, however, forms a fork or yoke, C, which is pivoted tothe opposite ends ot' the upper yoke or frame-piece, A, by bolts or clampscrews e, which permit its angle relatively to the frame to be varied as required. A gallowsframe, D, formed with or detaclr ably connected with the upper yoke, A, is provided with a telescoping screw, E, operated by ahandewheel, The male screw E works in a female screw in the section E,

These yokes are connected by which in turn carries a male screw, passing through a cross-piece, F, supporting the motor and drilling mechanism. This arrangement is a compact one, giving a large range of adjustment to the drill, while the screw" works in a small'space. The upper crosspiece, F, slips over the core-pieces G G of the motor-magnets, and is secured by nuts f, which permit of the removal of the cross-piece and the ready removal or replacement of the bob- ICO bins H. H of the held-magnets. The lower bobbins, H2 H3, are similarly secured upon other non-magnetic metal.

. support.

The revolving armature H4, which is pref- `erably of the Gramme-ring. type, is mounted on a crank-shaft, I, revolving freely in bearings in spidersv It h2, bolted to the front and back of the pole-pieces Gr2 G3. These spiders thus serve not only as cross-braces for the pole-pieces, but afford a firm bearing for each end of the crank or armature shaft. This shaft projects both back and front beyond the face of the spiders, and is provided with cranks i t at each end. The pole-pieces of the fieldmagnets, as well as the armature, it will be observed, are flattened, so as to bring the cranks as close together as practicable, as this construction promotes stability of movement.y

The commutato'r-brushes are mounted upon insulated posts h3, carried by one of the spiderframes and projecting inwardly, as clearly shown in Fig. 3, into the face of the armaturering, the commutator being located in this instance on the armature-shaft within the face of the armature-ring. It will be observed that the spokes or frame I-I of the armature are arranged to one side of the vertical center of the wheel, as clearly shown in Fig. 3, so as to afford a chamber or recess for the commutator ring and brushes. This structure is compact and enables me to use a very short crank or armature shaft, and to locate the commutator wheel and brushes between the cranks. While I prefer such an organization, I do not, however, limit the invention to it. Connectingrods J, pivoted at one end to the cranks on the armature-shaft, are connected at the other with a cross-head, J, which carries the drillstock and slides vertically in or on guides j on the lower cross-piece, F.

The drill K is mounted in well-known ways in the drill-stock K', which reciprocates in a guide, F3, bolted to the under side of the crosspiece F. lt is essential to efficient work that the drill should not only be capable of reciprocating freely, but of rotating axially in its This latter movement may be obtained in well-known ways. The preferred mode is the following well-known form: The drill-stock revolves and reciprocates in a socket, L, turning loosely in its support in the cross-piece F. This socket carries a colv lar, L', provided with a ratchet, with which a pawl, Z, pivoted on the cross-piece F engages. A screw, Z, on the collar' projects into an inclined groove, g2, on the drill-stock. On the .upward stroke ot' the stock the pawl holds the ratchet, and the stock is thus partly turned in the socket. On the downward stroke the pawl slips on the ratchet and the stock is not turned. Theorganization above described would give the ordinary reciprocating crank movement to the drill; but as it is advantageous to prevent shocks and jars to themechanisni and to impart a darting or thrusting stroke to the drill, I mount a spring, M M', on each side of the cross-head and connect the drill-stock with these springs. Spiral springs surrounding the stock above and below the cross-head are shown in this instance; the construction will be plain. Owing to this organization,'on the upstroke ofthe crank the drill is cushioned by the compression of the upper spring, M, while it is lifted to some extent by the expansion of the lower spring, M. On the downstroke these conditions are reversed, the lower spring being compressed and the upper spring being expanded, thus giving a thrusting stroke. The end-play of the drillstock in its bearings thus obtained acts as a cushion to prevent communication Vof shocks and jars to the frame r motor.

vThe drill and motor can readily be adjusted 4 on the frame by the telcscoping screw, guides, or eyes n, attached tothe pole-pieces for that purpose, traversing on the connecting-bars which unite the yokes of the frame.

The electrical connections are preferably arranged in the following manner: The bobbins of the field-magnets are connected in series, the circuit-wire fw from the generator passing from the upper bobbin, H, to the corresponding one, I-I, then to the lower bobbin, H3, through the commutator and armature-coils to t-he lower bobbin, H2, and 'then back to the generator, the direction of the current being indicated by the arrows in Fig. l. A switch, S, of well-known construction, serves to cut off the current' when desired.

It will be observed that the frame within which the motor and drillstock are mounted and fed surrounds and projects beyond vthe planesof the outer faces of the motor, so that all the parts of the motor, the cranks, and the connecting-rods are in a measure protected against accidental injury by the overturning of the drill, or otherwise.

IVhen the machine is folded for shipment or storage, thelegs are telescoped and the upper legs turned up alongside of the motor. When thus folded, the legs serve as a further protection to the motor.

As before remarked, I prefer to lconstruct my motor with a flat compact armature,which may be of the Gramme type or a bobbin armature. This structure is preferred for the reason that a short armature-shaft may be used, so that the cranks thereon can be close together and the cross-head with which they are connected be short. This gives a greater efficiency and stability-of action. So far, however, as the broader'aspect of my invention is concerned, any of the other well-known types of armatures may be employed.

It will be observed that the motor is carried and adj usted in the longitudinal central aXis of the supporting-frame, that the drill-stock is arranged in the sameline,and that the power, being taken from both ends of the armatureshaft, is also symmetrically applied around the IIO vis

same eenter. This organization prevents any lat-eral jarring or wabbling of the machine and gives a well-balanced and steady action of the drill, which is one of the chief results l have sought to effect.

I am aware that, broadly, it is not'new to operate a crank-shaft directly f rom the spindle of a rotating armature. VI am also aware that, broadly, a commutator-ring inelosed within an armature-ring is old.

I. claim as my inventionl. In a drill, the combination of a frame, a rotary electric motor mounted in the frame, mechanism for adjusting or feeding the motor relatively to the frame, adrill-stock, and a crank-and-pitman connection by which the drillstoek is connected with the spindle ofthe motor.

2. The combination of the drill-frame, a ro` tary electric motor mounted and moving longitudinally therein, mechanism for adjusting or feeding the motor relatively to the frame, a drill-stock, a cross-head connected with the drill-stoek,a11d a pitman-and-crank connection between each end of the cross-head and each end of the spindle of the electric motor, substantially as and for the purpose set forth.

3. The combination of the drill-frame consistingof upper and lower yokes and connectingbars, a rotary electric motor mounted on the drill-frame and adapted to move longitudinally through the yokes of the frame, mechanism for adjusting or feeding the motor relatively to the frame, a drill-stock, and a crankand-pitman connection between the drill-stock and spindle of the rotary electric motor, substantially as set forth.

t. The combination of a drill-frame having upper and lower yokes and connecting-bars, adjustable legs by which the frame is supported, an electric motor carried by the frame and adapted to move longitudinally through the upper and lower yokes, thelongitudinal center ofthe motor and drill-frame coinciding, a drill-stock arranged in the same longitudinal central line, and a crank-and-pitman connection between the drill-stock and each end of the spindle of the rotary motor, substantially as setforth.

5. The combination of a drill-frame, a rotary electric motor mounted therein, mechanism for adjusting or moving the motor longitudinally relatively to the frame, a drillstoek, the driving-connection between the drill-stock and the spindle of the roi ary motor, and impelling and cushioning` springs interposed between the driving-connection and the drillstock, substantially as and for the purpose sety forth.

6. The combination of the drill-frame, a rotary electric motor mounted therein, adj Listing mechanism mounted on the frame and connected with the motor, consisting of the gallowsframe and the double -screw feeding device, whereby the motor is moved longitudinally relatively to the frame, a drill-stock, and a crank-and-pitman connection between the drill-stock and the spindle of the rotary motor, substantially as set forth.

7. The combination of a drill-frame, the rotary electric motor mounted thereon and adjustable longitudinally relatively thereto, the vmotor consisting of field-magnets, an armature-ring, and commutator devices arranged within the face of the armature-ring and Within the planes of the sides of the field-magnets, a drill-stock, and crank-and-pitman connections between the drill-stock and each end of the spindle of the armature-ring, the crank connectionsV with the spindle being located outside of the eommutator, substantially as set forth.

8. The combination of a drill-frame having upper and lower yokes andV connecting-bars, the rotary electric motor mounted in the frame and adapted to move longitudinally through the upper and lower yokes, the spider-frames connecting the poles of the fieldmagnets of the motor, in which spiders the spindle ofthe rotary armature has its bearings, the commutator devices located between the spiders, a drill-stock, and a crank-and-pitman connection between each end of the motor-spindle and the drill-stock, substantially as setV forth.

9. The combination of the drill-frame having upper and lower yokes and connectingbars, adjustable legs by which the frame is supported, an electric motor carried by the frame and adapted to move longitudinally through the upper and lower yokes, thelongitudinal center of the motor being arranged substantially in the longitudinal center of the drill-frame, a drill-stock arranged in the same longitudinal central line, and a drivingconneetion between the drill-stock and motor, substantially as set forth.

In testimony whereof I have hereunto subscribed my name.

LUGIUS J. PHELPS. XV i tnesses HENRY D. HALL, Y R. J. MONTGOMERY.

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